I'm 20 years old. My left eye power has sph - 0.50,cyl is - 0.50, axis is 180 and right eye power has only sph that is - 0.75. What is the meaning of all that? What should I do? Is it necessary to wear glasses all the time? Or will it affect my eyes more like will my power increase or decrease after some months? What shall I do to make the power of eye constant and for a healthy eye. please give some effective answers doctor.